culmulative update...

* holding down space, or using the third mouse button, will force
  the "pan canvas" mode
* using the mouse wheel zooms in and out
* fixed issues with the undo commands when nudging something with
  the cursor keys
* manipulators can now indicate wether they changed the mouse cursor
* ChangePointCommand is no longer inserted if the point didn't change
* new "flip" points feature in context menu, flips "in" and "out" curve
  control points
* mouse wheel events are now propagated together with the mouse position
* new "UndoesPrevious" method in Command interface (used to clean up
  command stack)
* clean ups in CommandStack



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20623 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/icon-o-matic/CanvasView.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -9,10 +9,14 @@
 #include "CanvasView.h"
 
 #include <Bitmap.h>
+#include <Cursor.h>
+#include <Message.h>
 #include <Region.h>
+#include <Window.h>
 
 #include <stdio.h>
 
+#include "cursors.h"
 #include "ui_defines.h"
 
 #include "CommandStack.h"
@@ -33,6 +37,10 @@ CanvasView::CanvasView(BRect frame)
 	  fCanvasOrigin(0.0, 0.0),
 	  fZoomLevel(1.0),
 
+	  fSpaceHeldDown(false),
+	  fScrollTracking(false),
+	  fScrollTrackingStart(0.0, 0.0),
+
 	  fMouseFilterMode(SNAPPING_OFF),
 
 	  fOffsreenBitmap(NULL),
@@ -136,7 +144,66 @@ CanvasView::MouseDown(BPoint where)
 	if (!IsFocus())
 		MakeFocus(true);
 
-	StateView::MouseDown(where);
+	uint32 buttons;
+	if (Window()->CurrentMessage()->FindInt32("buttons",
+		(int32*)&buttons) < B_OK)
+		buttons = 0;
+
+	// handle clicks of the third mouse button ourselves (panning),
+	// otherwise have StateView handle it (normal clicks)
+	if (fSpaceHeldDown || buttons & B_TERTIARY_MOUSE_BUTTON) {
+		// switch into scrolling mode and update cursor
+		fScrollTracking = true;
+		where.x = roundf(where.x);
+		where.y = roundf(where.y);
+		fScrollOffsetStart = ScrollOffset();
+		fScrollTrackingStart = where - fScrollOffsetStart;
+		_UpdateToolCursor();
+		SetMouseEventMask(B_POINTER_EVENTS,
+						  B_LOCK_WINDOW_FOCUS | B_SUSPEND_VIEW_FOCUS);
+	} else {
+		StateView::MouseDown(where);
+	}
+}
+
+// MouseUp
+void
+CanvasView::MouseUp(BPoint where)
+{
+	if (fScrollTracking) {
+		// stop scroll tracking and update cursor
+		fScrollTracking = false;
+		_UpdateToolCursor();
+		// update StateView mouse position
+		uint32 transit = Bounds().Contains(where) ?
+			B_INSIDE_VIEW : B_OUTSIDE_VIEW;
+		StateView::MouseMoved(where, transit, NULL);
+	} else {
+		StateView::MouseUp(where);
+	}
+}
+
+// MouseMoved
+void
+CanvasView::MouseMoved(BPoint where, uint32 transit, const BMessage* dragMessage)
+{
+	if (fScrollTracking) {
+		uint32 buttons;
+		GetMouse(&where, &buttons, false);
+		if (!buttons) {
+			MouseUp(where);
+			return;
+		}
+		where.x = roundf(where.x);
+		where.y = roundf(where.y);
+		where -= ScrollOffset();
+		BPoint offset = where - fScrollTrackingStart;
+		SetScrollOffset(fScrollOffsetStart - offset);
+	} else {
+		// normal mouse movement handled by StateView
+		if (!fSpaceHeldDown)
+			StateView::MouseMoved(where, transit, dragMessage);
+	}
 }
 
 // FilterMouse
@@ -180,6 +247,23 @@ CanvasView::FilterMouse(BPoint* where) const
 	}
 }
 
+// MouseWheelChanged
+bool
+CanvasView::MouseWheelChanged(BPoint where, float x, float y)
+{
+	if (!Bounds().Contains(where))
+		return false;
+
+	if (y > 0.0) {
+		_SetZoom(_NextZoomOutLevel(fZoomLevel));
+		return true;
+	} else if (y < 0.0) {
+		_SetZoom(_NextZoomInLevel(fZoomLevel));
+		return true;
+	}
+	return false;
+}
+
 // #pragma mark -
 
 // ScrollOffsetChanged
@@ -187,9 +271,15 @@ void
 CanvasView::ScrollOffsetChanged(BPoint oldOffset, BPoint newOffset)
 {
 	BPoint offset = newOffset - oldOffset;
+
+	if (offset == B_ORIGIN)
+		// prevent circular code (MouseMoved might call ScrollBy...)
+		return;
+
 	ScrollBy(offset.x, offset.y);
 
-	MouseMoved(fMouseInfo.position + offset, fMouseInfo.transit, NULL);
+	if (!fScrollTracking)
+		MouseMoved(fMouseInfo.position + offset, fMouseInfo.transit, NULL);
 }
 
 // VisibleSizeChanged
@@ -308,6 +398,11 @@ CanvasView::_HandleKeyDown(uint32 key, uint32 modifiers)
 			_SetZoom(_NextZoomOutLevel(fZoomLevel));
 			break;
 
+		case B_SPACE:
+			fSpaceHeldDown = true;
+			_UpdateToolCursor();
+			break;
+
 		default:
 			return StateView::_HandleKeyDown(key, modifiers);
 	}
@@ -315,6 +410,23 @@ CanvasView::_HandleKeyDown(uint32 key, uint32 modifiers)
 	return true;
 }
 
+// _HandleKeyUp
+bool
+CanvasView::_HandleKeyUp(uint32 key, uint32 modifiers)
+{
+	switch (key) {
+		case B_SPACE:
+			fSpaceHeldDown = false;
+			_UpdateToolCursor();
+			break;
+
+		default:
+			return StateView::_HandleKeyUp(key, modifiers);
+	}
+
+	return true;
+}
+
 // _CanvasRect()
 BRect
 CanvasView::_CanvasRect() const
@@ -473,6 +585,26 @@ CanvasView::_MakeBackground()
 	}
 }
 
+// _UpdateToolCursor
+void
+CanvasView::_UpdateToolCursor()
+{
+	if (fIcon) {
+		if (fScrollTracking || fSpaceHeldDown) {
+			// indicate scrolling mode
+			const uchar* cursorData = fScrollTracking ? kGrabCursor : kHandCursor;
+			BCursor cursor(cursorData);
+			SetViewCursor(&cursor, true);
+		} else {
+			// pass on to current state of StateView
+			UpdateStateCursor();
+		}
+	} else {
+		BCursor cursor(kStopCursor);
+		SetViewCursor(&cursor, true);
+	}
+}
+
 // #pragma mark -
 
 // _NextZoomInLevel

src/apps/icon-o-matic/CanvasView.h

@@ -43,8 +43,14 @@ class CanvasView : public StateView,
 	virtual	void				Draw(BRect updateRect);
 
 	virtual	void				MouseDown(BPoint where);
+	virtual	void				MouseUp(BPoint where);
+	virtual	void				MouseMoved(BPoint where, uint32 transit,
+										   const BMessage* dragMessage);
 	virtual	void				FilterMouse(BPoint* where) const;
 
+	virtual	bool				MouseWheelChanged(BPoint where,
+												  float x, float y);
+
 	// Scrollable interface
  protected:
 	virtual	void				ScrollOffsetChanged(BPoint oldOffset,
@@ -76,6 +82,7 @@ class CanvasView : public StateView,
  protected:
 	// StateView interface
 	virtual	bool				_HandleKeyDown(uint32 key, uint32 modifiers);
+	virtual	bool				_HandleKeyUp(uint32 key, uint32 modifiers);
 
 	// CanvasView
 			BRect				_CanvasRect() const;
@@ -88,6 +95,8 @@ class CanvasView : public StateView,
 
 			void				_MakeBackground();
 
+			void				_UpdateToolCursor();
+
  private:
 			double				_NextZoomInLevel(double zoom) const;
 			double				_NextZoomOutLevel(double zoom) const;
@@ -105,6 +114,11 @@ class CanvasView : public StateView,
 			BPoint				fCanvasOrigin;
 			double				fZoomLevel;
 
+			bool				fSpaceHeldDown;
+			bool				fScrollTracking;
+			BPoint				fScrollTrackingStart;
+			BPoint				fScrollOffsetStart;
+
 			uint32				fMouseFilterMode;
 
 			BBitmap*			fOffsreenBitmap;

src/apps/icon-o-matic/Jamfile

@@ -243,6 +243,7 @@ Application Icon-O-Matic :
 	AddTransformersCommand.cpp
 	ChangePointCommand.cpp
 	CleanUpPathCommand.cpp
+	FlipPointsCommand.cpp
 	FreezeTransformationCommand.cpp
 	InsertPointCommand.cpp
 	MoveShapesCommand.cpp

src/apps/icon-o-matic/generic/command/Command.cpp

@@ -58,6 +58,13 @@ Command::GetName(BString& name)
 	name << "Name of action goes here.";
 }
 
+// UndoesPrevious
+bool
+Command::UndoesPrevious(const Command* previous)
+{
+	return false;
+}
+
 // CombineWithNext
 bool
 Command::CombineWithNext(const Command* next)

src/apps/icon-o-matic/generic/command/Command.h

@@ -27,6 +27,7 @@ class Command {
 
 	virtual void				GetName(BString& name);
 
+	virtual	bool				UndoesPrevious(const Command* previous);
 	virtual	bool				CombineWithNext(const Command* next);
 	virtual	bool				CombineWithPrevious(const Command* previous);
 

src/apps/icon-o-matic/generic/command/CommandStack.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -34,23 +34,25 @@ CommandStack::~CommandStack()
 status_t
 CommandStack::Perform(Command* command)
 {
+	if (!Lock())
+		return B_ERROR;
+
 	status_t ret = command ? B_OK : B_BAD_VALUE;
-	if (Lock()) {
-		if (ret == B_OK)
-			ret = command->InitCheck();
-	
-		if (ret == B_OK)
-			ret = command->Perform();
-	
-		if (ret == B_OK)
-			ret = _AddCommand(command);
-	
-		if (ret != B_OK) {
-			// no one else feels responsible...
-			delete command;
-		}
-		Unlock();
+	if (ret == B_OK)
+		ret = command->InitCheck();
+
+	if (ret == B_OK)
+		ret = command->Perform();
+
+	if (ret == B_OK)
+		ret = _AddCommand(command);
+
+	if (ret != B_OK) {
+		// no one else feels responsible...
+		delete command;
 	}
+
+	Unlock();
 	return ret;
 }
 
@@ -58,19 +60,20 @@ CommandStack::Perform(Command* command)
 status_t
 CommandStack::Undo()
 {
+	if (!Lock())
+		return B_ERROR;
+
 	status_t status = B_ERROR;
-	if (Lock()) {
-		if (!fUndoHistory.empty()) {
-			Command* command = fUndoHistory.top();
-			fUndoHistory.pop();
-			status = command->Undo();
-			if (status == B_OK)
-				fRedoHistory.push(command);
-			else
-				fUndoHistory.push(command);
-		}
-		Unlock();
+	if (!fUndoHistory.empty()) {
+		Command* command = fUndoHistory.top();
+		fUndoHistory.pop();
+		status = command->Undo();
+		if (status == B_OK)
+			fRedoHistory.push(command);
+		else
+			fUndoHistory.push(command);
 	}
+	Unlock();
 
 	Notify();
 
@@ -81,19 +84,20 @@ CommandStack::Undo()
 status_t
 CommandStack::Redo()
 {
+	if (!Lock())
+		return B_ERROR;
+
 	status_t status = B_ERROR;
-	if (Lock()) {
-		if (!fRedoHistory.empty()) {
-			Command* command = fRedoHistory.top();
-			fRedoHistory.pop();
-			status = command->Redo();
-			if (status == B_OK)
-				fUndoHistory.push(command);
-			else
-				fRedoHistory.push(command);
-		}
-		Unlock();
+	if (!fRedoHistory.empty()) {
+		Command* command = fRedoHistory.top();
+		fRedoHistory.pop();
+		status = command->Redo();
+		if (status == B_OK)
+			fUndoHistory.push(command);
+		else
+			fRedoHistory.push(command);
 	}
+	Unlock();
 
 	Notify();
 
@@ -187,29 +191,56 @@ status_t
 CommandStack::_AddCommand(Command* command)
 {
 	status_t status = B_OK;
-	// try to collapse commands to a single command
+
 	bool add = true;
 	if (!fUndoHistory.empty()) {
+		// try to collapse commands to a single command
+		// or remove this and the previous command if
+		// they reverse each other
 		if (Command* top = fUndoHistory.top()) {
-			if (top->CombineWithNext(command)) {
+			if (command->UndoesPrevious(top)) {
+				add = false;
+				fUndoHistory.pop();
+				delete top;
+				delete command;
+			} else if (top->CombineWithNext(command)) {
 				add = false;
 				delete command;
+				// after collapsing, the command might
+				// have changed it's mind about InitCheck()
+				// (the commands reversed each other)
+				if (top->InitCheck() < B_OK) {
+					fUndoHistory.pop();
+					delete top;
+				}
 			} else if (command->CombineWithPrevious(top)) {
 				fUndoHistory.pop();
 				delete top;
+				// after collapsing, the command might
+				// have changed it's mind about InitCheck()
+				// (the commands reversed each other)
+				if (command->InitCheck() < B_OK) {
+					delete command;
+					add = false;
+				}
 			}
 		}
 	}
 	if (add) {
-		// TODO: check return value and set status
-		fUndoHistory.push(command);
+		try {
+			fUndoHistory.push(command);
+		} catch (...) {
+			status = B_ERROR;
+		}
 	}
 
-	// the redo stack needs to be empty
-	// as soon as a command was added (also in case of collapsing)
-	while (!fRedoHistory.empty()) {
-		delete fRedoHistory.top();
-		fRedoHistory.pop();
+	if (status == B_OK) {
+		// the redo stack needs to be empty
+		// as soon as a command was added (also in case of collapsing)
+		while (!fRedoHistory.empty()) {
+			delete fRedoHistory.top();
+			fRedoHistory.pop();
+		}
 	}
 
 	Notify();

src/apps/icon-o-matic/generic/gui/stateview/Manipulator.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -106,9 +106,10 @@ Manipulator::HandleKeyUp(uint32 key, uint32 modifiers, Command** _command)
 }
 
 // UpdateCursor
-void
+bool
 Manipulator::UpdateCursor()
 {
+	return false;
 }
 
 // #pragma mark -

src/apps/icon-o-matic/generic/gui/stateview/Manipulator.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -44,7 +44,7 @@ class Manipulator : public Observer {
 	virtual	bool				HandleKeyUp(uint32 key, uint32 modifiers,
 											Command** _command);
 
-	virtual	void				UpdateCursor();
+	virtual	bool				UpdateCursor();
 
 	virtual	BRect				Bounds() = 0;
 		// the area that the manipulator is

src/apps/icon-o-matic/generic/gui/stateview/MultipleManipulatorState.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -172,6 +172,10 @@ bool
 MultipleManipulatorState::HandleKeyDown(uint32 key, uint32 modifiers,
 										Command** _command)
 {
+	// TODO: somehow this looks suspicious, because it doesn't
+	// seem guaranteed that the manipulator having indicated to
+	// handle the key down handles the matching key up event...
+	// maybe there should be the concept of the "focused manipulator"
 	int32 count = fManipulators.CountItems();
 	for (int32 i = 0; i < count; i++) {
 		Manipulator* manipulator =
@@ -197,6 +201,15 @@ MultipleManipulatorState::HandleKeyUp(uint32 key, uint32 modifiers,
 	return false;
 }
 
+// UpdateCursor
+bool
+MultipleManipulatorState::UpdateCursor()
+{
+	if (fPreviousManipulator && fManipulators.HasItem(fPreviousManipulator))
+		return fPreviousManipulator->UpdateCursor();
+	return false;
+}
+
 // #pragma mark -
 
 // AddManipulator

src/apps/icon-o-matic/generic/gui/stateview/MultipleManipulatorState.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -44,6 +44,8 @@ class MultipleManipulatorState : public ViewState {
 	virtual	bool				HandleKeyUp(uint32 key, uint32 modifiers,
 											Command** _command);
 
+	virtual	bool				UpdateCursor();
+
 	// MultipleManipulatorState
 			bool				AddManipulator(Manipulator* manipulator);
 			Manipulator*		RemoveManipulator(int32 index);

src/apps/icon-o-matic/generic/gui/stateview/StateView.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -78,7 +78,8 @@ if (dynamic_cast<GradientControl*>(*target))
 					float y;
 					if (message->FindFloat("be:wheel_delta_x", &x) >= B_OK
 						&& message->FindFloat("be:wheel_delta_y", &y) >= B_OK) {
-						if (fTarget->MouseWheelChanged(x, y))
+						if (fTarget->MouseWheelChanged(
+								fTarget->MouseInfo()->position, x, y))
 							result = B_SKIP_MESSAGE;
 					}
 					break;
@@ -330,6 +331,15 @@ StateView::SetState(ViewState* state)
 		fCurrentState->Init();
 }
 
+// UpdateStateCursor
+void
+StateView::UpdateStateCursor()
+{
+	if (!fCurrentState || !fCurrentState->UpdateCursor()) {
+		SetViewCursor(B_CURSOR_SYSTEM_DEFAULT, true);
+	}
+}
+
 // Draw
 void
 StateView::Draw(BView* into, BRect updateRect)
@@ -350,7 +360,7 @@ StateView::Draw(BView* into, BRect updateRect)
 
 // MouseWheelChanged
 bool
-StateView::MouseWheelChanged(float x, float y)
+StateView::MouseWheelChanged(BPoint where, float x, float y)
 {
 	return false;
 }
@@ -359,6 +369,11 @@ StateView::MouseWheelChanged(float x, float y)
 bool
 StateView::HandleKeyDown(uint32 key, uint32 modifiers)
 {
+	// down't allow key events if mouse already pressed
+	// (central place to prevent command stack mix up)
+	if (fMouseInfo.buttons != 0)
+		return false;
+
 	AutoWriteLocker locker(fLocker);
 	if (fLocker && !locker.IsLocked())
 		return false;
@@ -380,6 +395,11 @@ StateView::HandleKeyDown(uint32 key, uint32 modifiers)
 bool
 StateView::HandleKeyUp(uint32 key, uint32 modifiers)
 {
+	// down't allow key events if mouse already pressed
+	// (central place to prevent command stack mix up)
+	if (fMouseInfo.buttons != 0)
+		return false;
+
 	AutoWriteLocker locker(fLocker);
 	if (fLocker && !locker.IsLocked())
 		return false;

src/apps/icon-o-matic/generic/gui/stateview/StateView.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -40,10 +40,12 @@ class StateView : public BView {
 
 	// StateView interface
 			void				SetState(ViewState* state);
+			void				UpdateStateCursor();
 
 			void				Draw(BView* into, BRect updateRect);
 
-	virtual	bool				MouseWheelChanged(float x, float y);
+	virtual	bool				MouseWheelChanged(BPoint where,
+												  float x, float y);
 
 			bool				HandleKeyDown(uint32 key, uint32 modifiers);
 			bool				HandleKeyUp(uint32 key, uint32 modifiers);

src/apps/icon-o-matic/generic/gui/stateview/ViewState.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -109,4 +109,9 @@ ViewState::HandleKeyUp(uint32 key, uint32 modifiers, Command** _command)
 	return false;
 }
 
-
+// UpdateCursor
+bool
+ViewState::UpdateCursor()
+{
+	return false;
+}

src/apps/icon-o-matic/generic/gui/stateview/ViewState.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -57,6 +57,8 @@ class ViewState {
 	virtual	bool				HandleKeyUp(uint32 key, uint32 modifiers,
 											Command** _command);
 
+	virtual	bool				UpdateCursor();
+
 
 	inline	uint32				PressedMouseButtons() const
 									{ return fMouseInfo->buttons; }

src/apps/icon-o-matic/generic/gui/ui_defines.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:

src/apps/icon-o-matic/import_export/svg/DocumentBuilder.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku. All rights reserved.
+ * Copyright 2006-2007, Haiku. All rights reserved.
  * Distributed under the terms of the MIT License.
  *
  * Authors:

src/apps/icon-o-matic/shape/PathManipulator.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -26,6 +26,7 @@
 #include "ChangePointCommand.h"
 //#include "CloseCommand.h"
 #include "InsertPointCommand.h"
+#include "FlipPointsCommand.h"
 //#include "NewPathCommand.h"
 #include "NudgePointsCommand.h"
 //#include "RemovePathCommand.h"
@@ -74,6 +75,7 @@ enum {
 	MSG_UPDATE_SHAPE_UI			= 'udsi',
 
 	MSG_SPLIT_POINTS			= 'splt',
+	MSG_FLIP_POINTS				= 'flip',
 };
 
 inline const char*
@@ -773,6 +775,11 @@ PathManipulator::ShowContextMenu(BPoint where)
 	item->SetEnabled(hasSelection);
 	menu->AddItem(item);
 
+	message = new BMessage(MSG_FLIP_POINTS);
+	item = new BMenuItem("Flip", message);
+	item->SetEnabled(hasSelection);
+	menu->AddItem(item);
+
 	message = new BMessage(MSG_REMOVE_POINTS);
 	item = new BMenuItem("Remove", message, 'A');
 	item->SetEnabled(hasSelection);
@@ -829,6 +836,11 @@ PathManipulator::MessageReceived(BMessage* message, Command** _command)
 											   fSelection->Items(),
 											   fSelection->CountItems());
 			break;
+		case MSG_FLIP_POINTS:
+			*_command = new FlipPointsCommand(fPath,
+											  fSelection->Items(),
+											  fSelection->CountItems());
+			break;
 		case B_SELECT_ALL: {
 			*fOldSelection = *fSelection;
 			fSelection->MakeEmpty();
@@ -958,13 +970,12 @@ PathManipulator::HandleKeyUp(uint32 key, uint32 modifiers, Command** _command)
 }
 
 // UpdateCursor
-void
+bool
 PathManipulator::UpdateCursor()
 {
-	if (fTransformBox) {
-		fTransformBox->UpdateCursor();
-		return;
-	}
+	if (fTransformBox)
+		return fTransformBox->UpdateCursor();
+
 	const uchar* cursorData;
 	switch (fMode) {
 		case ADD_POINT:
@@ -1008,6 +1019,8 @@ PathManipulator::UpdateCursor()
 	BCursor cursor(cursorData);
 	fCanvasView->SetViewCursor(&cursor, true);
 	fCanvasView->Sync();
+
+	return true;
 }
 
 // AttachedToView

src/apps/icon-o-matic/shape/PathManipulator.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -59,7 +59,7 @@ class PathManipulator : public Manipulator,
 	virtual	bool				HandleKeyUp(uint32 key, uint32 modifiers,
 											Command** _command);
 
-	virtual	void				UpdateCursor();
+	virtual	bool				UpdateCursor();
 
 	virtual	void				AttachedToView(BView* view);
 	virtual	void				DetachedFromView(BView* view);

src/apps/icon-o-matic/shape/commands/ChangePointCommand.cpp

@@ -39,6 +39,32 @@ ChangePointCommand::~ChangePointCommand()
 	delete[] fOldSelection;
 }
 
+// InitCheck
+status_t
+ChangePointCommand::InitCheck()
+{
+	// TODO: figure out if selection changed!!!
+	// (this command is also used to undo changes to the selection)
+	// (but tracking the selection does not yet work in Icon-O-Matic)
+	
+	status_t ret = PathCommand::InitCheck();
+	if (ret < B_OK)
+		return ret;
+
+	BPoint point;
+	BPoint pointIn;
+	BPoint pointOut;
+	bool connected;
+	if (!fPath->GetPointsAt(fIndex, point, pointIn, pointOut, &connected))
+		return B_ERROR;
+
+	if (point != fPoint || pointIn != fPointIn
+		|| pointOut != fPointOut || connected != fConnected)
+		return B_OK;
+
+	return B_ERROR;
+}
+
 // Perform
 status_t
 ChangePointCommand::Perform()

src/apps/icon-o-matic/shape/commands/ChangePointCommand.h

@@ -21,6 +21,8 @@ class ChangePointCommand : public PathCommand {
 												   int32 count);
 	virtual						~ChangePointCommand();
 
+	virtual	status_t			InitCheck();
+
 	virtual	status_t			Perform();
 	virtual status_t			Undo();
 	virtual status_t			Redo();

src/apps/icon-o-matic/transformable/ResetTransformationCommand.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku. All rights reserved.
+ * Copyright 2006-2007, Haiku. All rights reserved.
  * Distributed under the terms of the MIT License.
  *
  * Authors:

src/apps/icon-o-matic/transformable/TransformBox.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -299,16 +299,19 @@ TransformBox::HandleKeyUp(uint32 key, uint32 modifiers, Command** _command)
 	return false;
 }
 
-// #pragma mark -
-
 // UpdateCursor
-void
+bool
 TransformBox::UpdateCursor()
 {
-	if (fCurrentState)
+	if (fCurrentState) {
 		fCurrentState->UpdateViewCursor(fView, fMousePos);
+		return true;
+	}
+	return false;
 }
 
+// #pragma mark -
+
 // AttachedToView
 void
 TransformBox::AttachedToView(BView* view)

src/apps/icon-o-matic/transformable/TransformBox.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -54,7 +54,7 @@ class TransformBox : public ChannelTransform,
 	virtual	bool				HandleKeyUp(uint32 key, uint32 modifiers,
 											Command** _command);
 
-	virtual	void				UpdateCursor();
+	virtual	bool				UpdateCursor();
 
 	virtual	void				AttachedToView(BView* view);
 	virtual	void				DetachedFromView(BView* view);

src/apps/icon-o-matic/transformable/TransformCommand.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Haiku.
+ * Copyright 2006-2007, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -72,8 +72,8 @@ TransformCommand::InitCheck()
 		 || fNewXScale != fOldXScale
 		 || fNewYScale != fOldYScale))
 		return B_OK;
-	else
-		return B_NO_INIT;
+	
+	return B_NO_INIT;
 }
 
 // Perform
@@ -88,30 +88,24 @@ TransformCommand::Perform()
 status_t
 TransformCommand::Undo()
 {
-	status_t status = InitCheck();
-	if (status >= B_OK) {
-		_SetTransformation(fOldPivot,
-						   fOldTranslation,
-						   fOldRotation,
-						   fOldXScale,
-						   fOldYScale);
-	}
-	return status;
+	_SetTransformation(fOldPivot,
+					   fOldTranslation,
+					   fOldRotation,
+					   fOldXScale,
+					   fOldYScale);
+	return B_OK;
 }
 
 // Redo
 status_t
 TransformCommand::Redo()
 {
-	status_t status = InitCheck();
-	if (status >= B_OK) {
-		_SetTransformation(fNewPivot,
-						   fNewTranslation,
-						   fNewRotation,
-						   fNewXScale,
-						   fNewYScale);
-	}
-	return status;
+	_SetTransformation(fNewPivot,
+					   fNewTranslation,
+					   fNewRotation,
+					   fNewXScale,
+					   fNewYScale);
+	return B_OK;
 }
 
 // GetName

src/apps/icon-o-matic/transformable/TransformObjectsCommand.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2007, Haiku.
+ * Copyright 2006-2007, Haiku. All rights reserved.
  * Distributed under the terms of the MIT License.
  *
  * Authors: